Correct rev 1.56 which (incorrectly) reversed the test used to decide if in_pcbpurgeif0 should be invoked.
Correct rev 1.56 which (incorrectly) reversed the test used to
decide if in_pcbpurgeif0 should be invoked.

Supported by:	FreeBSD Foundation

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase